Don't worry about the constipation. It will take care of itself though you could try a stool softener. (and it may be painful in your abdomen to try to go when your system isn't ready). The shoulder pain is from the gas they inflated you with. It will take a while to dissipate. That's normal. Try to walk as much as possible as that will help. And the joint pain is probably from not moving very much since the surgery.